Symbol
Tc
  
La
  
Group Number
Not Available
  
Period Number
5
  
6
  
Block
d block
  
f block
  
Element Family
Transition Metal
  
Lanthanide
  
Space Group Name
P63/mmc
  
P63/mmc
  
Interesting Facts
- Original name of Technetium was Masurium.
- At the time of its discovery it found in sample of Molybdenum.
  
- Lanthanum metal is highly malleable, ductile and sectile.
- If exposed to air Lanthanum metal oxidizes rapidly.
  
Sources
Made by Bombarding Molybdenum with Deuterons
  
Found in Minerals, Mining, Ores of Minerals
  
History
  
  
Who Discovered
Emilio Segrè and Carlo Perriero
  
Carl Gustaf Mosander
  
Discovery
In 1937
  
In 1838
  
Abundance
  
  
Abundance In Universe
Not Available
  
Abundance In Sun
~-9999 %
  
~0.0000002 %
  
25
Abundance In Meteorites
Not Available
  
Abundance In Earth's Crust
Not Available
  
Abundance In Oceans
Not Available
  
Uses & Benefits
- Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
  
- It has no commercial uses, but its alloys are in high demand. Lanthanum and Nickel alloy is used for the hydrogen gas storage.
- The best-known use for mischmetal alloy of Lanthanum is; as a ‘flints’ for cigarette lighters.
  
Industrial Uses
NA
  
Electrical Industry, Electronic Industry
  
Medical Uses
NA
  
NA
  
Other Uses
Alloys, Nuclear Research, Research Purposes
  
Alloys, Mirror Manufacturing
  
Biological Properties
  
  
Toxicity
Low Toxic
  
Low Toxic
  
Present in Human Body
No
  
Yes
  
In Blood
0.00 Blood/mg dm-3
  
37
Not Available
  
In Bone
0.00 p.p.m.
  
36
0.08 p.p.m.
  
24
Boiling Point
3,469.00 °C
  
18
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Shiny Gray
  
Silvery White
  
Luster
NA
  
NA
  
Hardness
  
  
Mohs Hardness
Not Available
  
Brinell Hardness
Not Available
  
Vickers Hardness
Not Available
  
Speed of Sound
16,200.00 m/s
  
1
2,475.00 m/s
  
37
Optical Properties
  
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Tc
  
La
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Allred Rochow Electronegativity
Allen Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
702.00 kJ/mol
  
36
538.10 kJ/mol
  
99+
2nd Energy Level
1,470.00 kJ/mol
  
99+
1,067.00 kJ/mol
  
99+
3rd Energy Level
2,850.00 kJ/mol
  
33
1,850.30 kJ/mol
  
99+
4th Energy Level
Not Available
  
4,819.00 kJ/mol
  
22
5th Energy Level
Not Available
  
5,940.00 kJ/mol
  
25
Electrochemical Equivalent
0.52 g/amp-hr
  
99+
1.73 g/amp-hr
  
99+
Electron Work Function
Not Available
  
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
  
Ionization, Radioactive Isotopes, Solubility
  
Electron Configuration
[Kr] 4d5 5s2
  
[Xe] 5d2 6s2
  
Crystal Structure
Hexagonal Close Packed (HCP)
  
Double Hexagonal Close Packed (DHCP)
  
Crystal Lattice
HCP-Crystal-Structure-of-Technetium.jpg#100
  
DHCP-Crystal-Structure-of-Lanthanum.jpg#100
  
Atom
  
  
Radius of an Atom
  
  
Atomic Weight
138.91 amu
  
99+
Atomic Volume
8.50 cm3/mol
  
99+
20.73 cm3/mol
  
16
Adjacent Atomic Numbers
  
  
Valence Electron Potential
180.00 (-eV)
  
3
40.71 (-eV)
  
99+
Lattice Angles
π/2, π/2, 2 π/3
  
π/2, π/2, 2 π/3
  
Density
  
  
Density At Room Temperature
11.00 g/cm3
  
34
6.16 g/cm3
  
99+
Density When Liquid (at m.p.)
Not Available
  
5.94 g/cm3
  
99+
Tensile Strength
Not Available
  
Not Available
  
Viscosity
Not Available
  
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available
  
Elasticity properties
  
  
Shear Modulus
Not Available
  
Bulk Modulus
Not Available
  
Young's Modulus
Not Available
  
Poisson Ratio
Not Available
  
Other Mechanical Properties
NA
  
Ductile
  
Magnetic Characteristics
  
  
Magnetic Ordering
Paramagnetic
  
Paramagnetic
  
Electrical Properties
  
  
Electrical Property
Conductor
  
Conductor
  
Resistivity
200.00 nΩ·m
  
18
Electrical Conductivity
0.07 106/cm Ω
  
30
0.01 106/cm Ω
  
99+
Electron Affinity
53.00 kJ/mol
  
18
48.00 kJ/mol
  
23
Specific Heat
0.21 J/(kg K)
  
29
0.19 J/(kg K)
  
32
Molar Heat Capacity
24.27 J/mol·K
  
99+
27.11 J/mol·K
  
21
Thermal Conductivity
50.60 W/m·K
  
30
13.40 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
7.10 µm/(m·K)
  
99+
12.10 µm/(m·K)
  
32
Enthalpy
  
  
Enthalpy of Vaporization
660.00 kJ/mol
  
6
399.60 kJ/mol
  
17
Enthalpy of Fusion
23.01 kJ/mol
  
9
6.20 kJ/mol
  
99+
Enthalpy of Atomization
649.00 kJ/mol
  
8
431.00 kJ/mol
  
16
Standard Molar Entropy
181.10 J/mol.K
  
2
56.90 J/mol.K
  
23